I had a 16x40 fiberglass pool installed last august. After being convinced to use baquacil we decided this year that we wanted to use chlorine. So we went back to the pool store and they had me start loading up with bags of restart which at the beginning made the pool slightly green.

After a few days the green disappeared and the baquacil level dropped to 0, but the baquacil shock was at about 90ppm.

After about 3 weeks of using about 7 bags of restart every few days and then cleaning the sand filter and backwashing the pool was crystal clear and the baquacil shock level hit 0.

My PH was low at about 6.8, alkalinity at about 80, so they had me start with chlorine (3 inch tablets and PH up).

After about 5 days I took a water sample in (that was this morning) and they told me I need to add alot of shock.

Prior to adding the shock the pool was crystal clear and clean.
I added 3 gallons of liquid shock and within minutes the pool has turned a murky green (like the pictures others have posted).

I am trying to find out what to do next. I see people talking about bleach are you speaking of shock?

The pool company told me to raise the alkalinity tomorrow.
Is this what I should be doing? Is their something else I should be doing. Do I need to be backwashing?

I do not have the option to let the water out, as it is fiberglass.

Can someone please let me know what to do next.

Thank you.